I really think they were designed for fretless though, but they sound quite well, and they look awesome... who else do you know that has black strings? well.. you could know lots of people.. but oh well

I like the sound of steel strings better but I have been using nickel strings lately because they are easier on my fingers and hands. I have a real bad dry skin problem on my hands and the steel just aggravate it. Nickel strings are softer and smother feeling steel are harder and more abrasive.